Vitamin C + vitamin E
What the sources say
Healthline treats vitamins C and E as a good match, and passes along a statement from the Linus Pauling Institute that the two protect against sun damage better than either one alone. It says both neutralize free radicals while targeting different kinds of UV harm. Cleveland Clinic's ferulic acid article also names the two among common skin care antioxidants. We ran no tests of our own for this page.
Where it can still go wrong
Healthline stresses that antioxidants are no substitute for sunscreen, though they may add to its effect, and quotes a dermatologist saying vitamins C and E plus sunscreen raise sun protection. That is general guidance. How a given serum behaves depends on its strength, its formula and your skin.
A cautious way to start
Cleveland Clinic's routine for an antioxidant serum is morning, after cleansing, with sunscreen last. For a new item, the AAD suggests a trial run first: a quarter-size patch on the inner arm or elbow crease, used as you normally would, twice a day, over seven to ten days. If a reaction shows up, the AAD says to rinse the product off and stop using it. Cosmetic guidance, not medical advice.
Check whether these products fit together See whether products on your shelf may clash and where they fit in an AM/PM routine. Cosmetic guidance, not a diagnosis. Sign up with Google to use the checker and get Pro free. No card or time limit. Sign up free and check my productsSources and limits
Healthline: ingredient combos that work well together
Cleveland Clinic: ferulic acid
AAD: how to test skin care products
Healthline is the source for the pairing and the sunscreen points; Cleveland Clinic is the source for the antioxidant context and the morning routine. Neither article tests a specific serum. The AAD page is the source for the testing steps.